N5 · Structured courses

Ku Naru / Ni Naru: Become

Learn to express change of state: くなる for i-adjectives, になる for nouns and na-adjectives. This lesson combines form, context, examples, common mistakes, and practice so you can use the pattern in real communication.

12 minNihongo Hub Editorial TeamPublished 2026-06-06Updated 2026-06-06

Learning objectives

  • Lesson goals: Learn to express change of state: くなる for i-adjectives, になる for nouns and na-adjectives.
  • Form and connection: [Adjective] くなる / [Noun/なAdjective] になる
  • Nuance in real use: くなる and になる reflect Japanese sensitivity to change — adjectives use く (gradual change), nouns use に (discrete shift). Two tiny particles embody different understandings of how the world works.

Form and connection

[Adjective] くなる / [Noun/なAdjective] になる

Core Explanation

Learn to express change of state: くなる for i-adjectives, になる for nouns and na-adjectives.

Cultural Note

くなる and になる reflect Japanese sensitivity to change — adjectives use く (gradual change), nouns use に (discrete shift). Two tiny particles embody different understandings of how the world works.

Practical examples

It has become warmer.
I want to become a doctor in the future.
The room became quiet.

Common pitfalls

Build the base form before adding the pattern

Complete the required conjugation first. Do not keep polite and plain endings at the same time.

Match politeness to the situation

The examples are reliable starting points; relationships and context can still change the most natural wording.

Practice and answers

1. Write the connection formula for this lesson.
Show answer[Adjective] くなる / [Noun/なAdjective] になる
2. Explain the meaning of the first example.
Show answerIt has become warmer.
3. Rewrite the final example using this lesson pattern.
Show answer部屋へやが静しずかになりました。 ([Adjective] くなる / [Noun/なAdjective] になる)

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